Advantech EKI-1521 - Figure 2.17 DIN-Rail Step 2; Network Connection; Power Connection; Figure 2.18 Power Connector

17 EKI-1521/1522/1524 User Manual
Chapter 2 Getting Started
Then, let the device down straight to slide over the rail smoothly.
Figure 2.17 DIN-rail Step 2
2.3.2 Network Connection
EKI-1521/1522/1524 has 2x RJ-45 that support connection to 10 Mbps Ethernet, or
100 Mbps Fast Ethernet, and half or full duplex operation. EKI-1521/1522/1524 can
be connected to other hubs or switches through a twisted-pair straight through the
cable or a crossover cable up to 100m long.
2.3.3 Power Connection
The EKI-1521/1522/1524 supports dual 12 to 48 VDC power inputs and power-fail
relay output.
Figure 2.18 Power Connector
You can connect an alarm indicator, buzzer or other signaling equipment through the
relay output. The relay opens if power input 1 or 2 fails (“Open” means if you connect
relay output with an LED, the light would be off).